[ISSUE #1047] support envoy gateway to get XDS rule

[chuntaojun]

Please provide issue(s) of this PR:
Fixes #1047

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Please check any characteristics that apply to this pull request.

• Does not have any user-facing changes. This may include API changes, behavior changes, performance improvements, etc.

[polaris-test-bot]

2023-03-27 23:54:58: =========TEST START==========
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[codecov]

Codecov Report

Merging #1046 (4b16453) into main (d914b43) will increase coverage by 0.01%.
The diff coverage is 65.38%.

@@            Coverage Diff             @@
##             main    #1046      +/-   ##
==========================================
+ Coverage   57.94%   57.96%   +0.01%     
==========================================
  Files         191      190       -1     
  Lines       34646    34635      -11     
==========================================
  Hits        20077    20077              
+ Misses      11964    11956       -8     
+ Partials     2605     2602       -3     

Impacted Files	Coverage Δ
config/config_file.go	51.72% <ø> (-0.33%)	⬇️
auth/defaultauth/auth_checker.go	77.57% <57.14%> (ø)
cache/routing_config.go	72.68% <100.00%> (ø)
cache/routing_config_bucket.go	70.28% <100.00%> (ø)
cache/routing_config_query.go	68.08% <100.00%> (ø)
cache/test_export.go	72.72% <100.00%> (+6.06%)	⬆️

... and 6 files with indirect coverage changes

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[andrewshan]

LGTM